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Topic: Northwest B-747 Hit By Lightning
Username: SIBILLE
Posted 2007-08-14 11:43:04 and read 9101 times.

According to Yahoo, a Northwest B-747 flying from Taipei to Tokyo was hit by lightning and had to come back for an emergency landing at Taipei. No information avaible yet about damages and actual aircraft position.

Topic: RE: Northwest B-747 Hit By Lightning
Username: Tdscanuck
Posted 2007-08-14 12:11:42 and read 9012 times.

Quoting SIBILLE (Thread starter):
Northwest B-747 flying from Taipei to Tokyo wasrnhit by lightning and had to come back for an emergency landing atrnTaipei.

Must have been a heck of a strike...usually they just keep going and do a lightning inspection when they arrive.

Tom.

Topic: RE: Northwest B-747 Hit By Lightning
Username: Paladin87
Posted 2007-08-14 13:02:46 and read 8866 times.

Didn't NWA discontinue that flight years ago Maybe it was the TPE-KIX flight

Topic: RE: Northwest B-747 Hit By Lightning
Username: Don81603
Posted 2007-08-14 16:35:31 and read 8561 times.

It's pretty clear that the designers and manufacturers would build in resistance from lightning strikes. But could it be possible for a strike in the nose to disrupt electronics and the avionics (the proverbial 1 in a million strike) to the point that the return was nessesitated by damage caused by the strike?

Topic: RE: Northwest B-747 Hit By Lightning
Username: JRadier
Posted 2007-08-14 16:47:18 and read 8500 times.

Quoting Tdscanuck (Reply 1):
Must have been a heck of a strike...usually they just keep going and do a lightning inspection when they arrive.

Just what I was thinking. I had a lightning strike last week on LH KBP-MUC, but there was no problem whatsoever. Strike was on the wingtipfence tho, pretty close to the dischargers.

Topic: RE: Northwest B-747 Hit By Lightning
Username: Tdscanuck
Posted 2007-08-14 17:08:06 and read 8381 times.

Quoting Don81603 (Reply 3):
But could it be possible for a strike in the nose to disrupt electronics and the avionics (the proverbial 1 in a million strike) to the point that the return was nessesitated by damage caused by the strike?

Anything's possible...the radome usually has great big diverter strips to protect against this. Based on the fact that the flight crew turned back, I've got to assume that something went screwy. Any strike on primary structure would typically go through the structure. All of the avionics are supposed to be able to take the transients that result from lightning current going through their ground path (the structure).

Quoting JRadier (Reply 4):
Strike was on the wingtipfence tho, pretty close to the dischargers.

The dischargers, at least on the Boeing's I'm familiar with, are mounted on the lightning diverter strip so that's pretty normal. The dischargers themselves don't offer any lightning protection, they're just there to disipate precipitation static.

Tom.

Topic: RE: Northwest B-747 Hit By Lightning
Username: C680
Posted 2007-08-15 03:42:59 and read 7577 times.

It was a NW Cargo flight that had a navigation equipment failure shortly after takeoff.

Taiwan Radio claimed a lightning strike, but that is unconfirmed.

Full story at:

http://www.news24.com/News24/World/News/0,,2-10-1462_2164457,00.html

Topic: RE: Northwest B-747 Hit By Lightning
Username: HAWK21M
Posted 2007-08-15 04:18:10 and read 6986 times.

Quoting Tdscanuck (Reply 5):
The dischargers themselves don't offer any lightning protection, they're just there to disipate precipitation static

 checkmark 
Probably some Avionics malfunction as a result of the strike that prompted a diversion.
regds
MEL

Topic: RE: Northwest B-747 Hit By Lightning
Username: Tdscanuck
Posted 2007-08-15 10:11:36 and read 4024 times.

Quoting HAWK21M (Reply 7):
Probably some Avionics malfunction as a result of the strike that prompted a diversion.

They must have bad karma...where I work now, we get about one lightning strike per week and we haven't fried any avionics yet.

Tom.

Topic: RE: Northwest B-747 Hit By Lightning
Username: Maverick623
Posted 2007-08-15 11:05:56 and read 3679 times.

Quoting Tdscanuck (Reply 1):
Must have been a heck of a strike...usually they just keep going and do a lightning inspection when they arrive.

Exactly what I was going to say. I constantly shock people when I mention that I hear of at least one strike per week... and that's just what I directly hear during 40 measly hours of working on the ramp at PHX.

Maybe it's a good thing people don't realize it... bet a lot of them wouldn't fly again (or maybe just not as often lol)

Topic: RE: Northwest B-747 Hit By Lightning
Username: EI321
Posted 2007-08-15 12:00:51 and read 3321 times.

As was said above, lightening strikes on planes are very common and usually harmless, so It must have been a serious one if the plane turned back.

Topic: RE: Northwest B-747 Hit By Lightning
Username: WILCO737
Posted 2007-08-15 12:38:58 and read 3259 times.

Maybe the crew in the cockpit got some weird indications... Maybe some of the avionics got too much current or voltage and quit... who knows...
But as said: usually a lightning strike isnt much of a big deal...

WILCO737 (MD11F)
 airplane 

Topic: RE: Northwest B-747 Hit By Lightning
Username: HAWK21M
Posted 2007-08-15 13:19:56 and read 3191 times.

Quoting Tdscanuck (Reply 8):
They must have bad karma...where I work now, we get about one lightning strike per week and we haven't fried any avionics yet

What fleet.
regds
MEL

Topic: RE: Northwest B-747 Hit By Lightning
Username: Tdscanuck
Posted 2007-08-15 14:53:40 and read 3100 times.

Quoting HAWK21M (Reply 12):
Quoting Tdscanuck (Reply 8):
They must have bad karma...where I work now, we get about one lightning strike per week and we haven't fried any avionics yet

What fleet.

737NG. We do replace a lot of winglets...

Tom.

Topic: RE: Northwest B-747 Hit By Lightning
Username: HAWK21M
Posted 2007-08-15 19:08:01 and read 2940 times.

Quoting Tdscanuck (Reply 13):
737NG. We do replace a lot of winglets...

Winglets replaced.Why.Or are you meaning static dischargers.
regds
MEL

Topic: RE: Northwest B-747 Hit By Lightning
Username: Tdscanuck
Posted 2007-08-16 07:28:10 and read 2673 times.

Quoting HAWK21M (Reply 14):
Quoting Tdscanuck (Reply 13):
737NG. We do replace a lot of winglets...

Winglets replaced.Why.Or are you meaning static dischargers.

No, I mean winglets (we replace static dischargers too). The winglets are frequent recipients of lightning strikes (all the pointy parts are). Due to flutter limitations, you're very limited on the repairs that you can do to a winglet and most of them are a whole lot easier to do off wing than on (it's mostly composite repair). So, if we get damage beyond allowable limits, we just replace the winglet with a fresh one and do the repair offline.

Tom.


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